St. Jude Medical Ab

Other

Hans Schüller

Anders Lindgren

Carl Johan Höijer

An implantable heart stimulating device has an ECG sensing unit to receive heart potential signals from sensing electrodes at an electrode lead arranged in connection with a patient's heart. The ECG sensing unit is provided with a programmable make-break threshold. The device further has a timer adapted to generate a make-break detection period, and a counter. The counter is adapted to count the number of times that the amplitude of the heart potential signal exceeds the programmable make-break threshold during the make-break detection period. When the number of times is higher than a predetermined value, the ECG obtained during the make-break detection period is stored in an ECG storage unit.

Implantable medical device with lead failure detection

A cardiac pacemaker has an algorithm for dynamic overdrive of a patient's atria in order to suppress atrial tachyarrhythmias. The device further has circuitry for adapting the AV-delay during dynamic overdrive of the atria to a value adapted to the patient's needs.

Implantable cardiac stimulator wherein AV-delay adjustment is limited during dynamic atrial overdrive

An implantable cardiac stimulating device has a pacing circuit connected via an electrode lead system to a first electrode which stimulates and detects activity in the left ventricle, a second electrode to stimulate and detect activity in the right atrium, and to a third electrode to detect activity in the left atrium. Upon the occurrence of a paced or sensed depolarization of the right atrium, a first AV-delay is started. When the subsequent left atrial depolarization is detected, a new AV-interval is started that is optimized for the left side of the heart. Either the left ventricle only, or both ventricles, is paced at the optimized left side AV-interval.

Cardiac stimulating device

A heart stimulator, operable for single-chamber and/or dual-chamber pacing, includes first and second electrical leads connected to a pulse generator and each terminating in an electrode, the electrodes being disposed respectively in the atrium and the ventricle. A differential detector is connected to the first and second leads and detects cardiac activity between the atrial electrode and the ventricular electrode. A correlation detector is connected between the pacemaker housing and one of the atrial or ventricular electrodes, and generates a correlation signal identifying whether the cardiac activity detected by the cardiac activity detector arose in the atrium or in the ventricle. The outputs of the differential detector and the correlation detector are supplied to a logic circuit which determines therefrom whether a stimulation pulse emitted by the pulse generator resulted in an evoked response in the heart.

Pacemaker with evoked response detection by using differential sensing

A pacemaker for stimulating both the atrium and the chamber of a heart is able to inhibit the emission of chamber stimulating pulses if a spontaneous chamber reaction is sensed before the expiry of an AV interval, counting from the emission of an atrial stimulating pulse. To prevent the pacemaker from being locked in a position where consecutive chamber stimulating pulses are emitted because of retrograde atrial reactions making the atrium insensitive to atrial stimulating pulses, the AV interval is shortened after the emission of a chamber stimulating pulse. After a predetermined time, a predetermined number of pulses, or when a spontaneous chamber reaction is sensed within the shortened AV interval, the longer AV interval is restored.

Growing community of inventors

Lund, Sweden

Hans Schüller